I am interested in trying the polyurethane method of glassing. My problem is deceiding between the worse of two evils. I am in Cincinnati, OH (outside temp around 20 degrees for the next couple of months). I can not use the laquer based in my garage because it is too cold. I build in my basement and am concerned about fumes (not to mention the open flame w/ the gas hot water heater). I am using it on a part taht is covered wtih 3/32 balsa. I have read that water based polyurethane sometimes warps and buckles 1/16 balsa - how is it with 3/32. Also, how much drying time should I allow between coats (basement temp around 65-68 degrees).

Thanks,
Keith